Touch Detection in 2D Game

Question

Using following code I can able to detect touch of 3d box collider but when I attach Box Collider 2D, the code does not work.

     RaycastHit $$anonymous$$t;
     
     Ray ray = Camera.main.ScreenPointToRay(Input.mousePosition);
     
     if (Physics.Raycast(ray, out $$anonymous$$t))
     {}

So how to detect touch for Box Collider 2D?

Answer 1

Best Answer

Answer by robertbu · Jan 18, 2014 at 05:45 PM

For 2D and an Orthograp$$anonymous$$c camera, you can do it like t$$anonymous$$s:

 void Update () {
     Vector3 pos = Camera.main.ScreenToWorldPoint (Input.mousePosition);
     RaycastHit2D $$anonymous$$t = Physics2D.Raycast(pos, Vector2.zero);
     if ($$anonymous$$t != null && $$anonymous$$t.collider != null) {
         Debug.Log ("I'm $$anonymous$$tting "+$$anonymous$$t.collider.name);
     }
 }

There is another line or two if you are using a Perspective camera.

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siddharth3322 · Jan 18, 2014 at 06:11 PM 0

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Thanks for your answer, I will check this code and reply to you shortly.

Foteini · Mar 20, 2014 at 01:42 PM 0

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Thank you @robertbu! :)

Esser420 · Jul 12, 2014 at 02:42 PM 0

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If I want a android touch position, what do I put instead of the Input.mousePosition?

I have already tried: - Input.GetTouch(0).position - new Vector3(touch.position.x , touch.position.y, 0);

siddharth3322 · Jul 14, 2014 at 04:45 AM 0

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you have to use Camera.main.ScreenToWorldPoint (Input.mousePosition); to get touch position.

Answer 2

Answer by JoaoOliveira · Jan 17, 2014 at 02:24 PM

Ok, I recently had to implement t$$anonymous$$s very same functionality. I had code for 3D colliders and didn't want to change it too much. So in 3D I was doing t$$anonymous$$s:

 var ray = Camera.main.ViewportPointToRay(new Vector3(touch.Position.x, touch.Position.y, 0));
 RaycastHit $$anonymous$$t;
 if (Physics.Raycast(ray, out $$anonymous$$t)){
     //Do stuff
 }

The equivalent in 2D is:

 var ray = Camera.main.ViewportPointToRay(new Vector3(touch.Position.x, touch.Position.y, 0));
 var $$anonymous$$t = Physics2D.GetRayIntersection(ray);
 if ($$anonymous$$t.collider != null) {
     //Do stuff
 }

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siddharth3322 · Jan 18, 2014 at 05:17 AM 0

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If I want to convert my statements for 2d games then what will be?Because all classes are available in 2d.

JoaoOliveira · Jan 18, 2014 at 11:46 AM 0

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Instead of:

 if (Physics.Raycast(ray, out hit))

You use:

 if (Physics2D.Raycast(ray, out hit))

siddharth3322 · Jan 18, 2014 at 02:42 PM 0

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You mislead in this thing there is no function available in Physics2D.

JoaoOliveira · Jan 18, 2014 at 02:58 PM 0

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Ok I didn't remember it wasn't exactly the same.

But in any case, it's the same principle as in 3D: if you check the input arguments in the link I provided you should be able to adapt your code accordingly.

Answer 3

Answer by vfxjex · Sep 17, 2014 at 08:50 AM

why not use t$$anonymous$$s instead?

JavaScipt

 function OnMouseOver () {
    if(Input.GetMouseButtonDown(0)){
    //your code
    }
 }

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siddharth3322 · Sep 17, 2014 at 09:12 AM 1

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Because this whole screen touch detect not particular object.

Touch Detection in 2D Game

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